In this guide, you will come to know how to place Doors and Windows in Icarus. You have to follow the simple steps in this guide to do so.
First, you need to go to your crafting table, select Thatch Wall, and then press the craft button on the right side of the screen, as shown in the image below.
After that, close all the tabs and get back into the game. You have to press the R button, and it will pop up a different option to apply the wall, select the doorway section wall and place it when you get the green signal.
Now, you will need to add a door in the empty space of the wall.